KR20110049050A - Method and apparatus for transmitting audio and video signal by one transmitting line - Google Patents

Abstract

PURPOSE: A method and apparatus for transmitting audio and video signal are provided to transmit video and audio signals using a single transmitting line thereby reducing facilities costs. CONSTITUTION: An image blank section detection unit detects an image scanning blank section from a video signal. An audio signal compression unit performs audio signal sampling. The audio signal compression unit compresses the sampled audio signal about the time axis coping with a video signal frequency. An audio signal composition unit synthesizes the compacted audio signal to the detected image scanning blank section. An image and audio transmitting unit transmits both signals through a single transceiving cable.

Description

Method and device for transmitting and receiving audio and video signal using single transmission cable {METHOD AND APPARATUS FOR TRANSMITTING AUDIO AND VIDEO SIGNAL BY ONE TRANSMITTING LINE}

The present invention relates to a method and apparatus for transmitting and receiving audio and video signals using a single transmit / receive cable, and can transmit both video and audio signals using only one transmit / receive path, thereby reducing the cost of installing a line, thereby enabling an effective system configuration. There is an advantage that it is easy to manage the reduction and installation costs, and in particular, there is no frequency band limitation of the video signal, and a method and apparatus for transmitting and receiving audio and video signals using a single transmit / receive cable that can perform the same while maintaining the signal quality of the existing video signal. It is about.

In order to transmit a general audio signal and a video signal, an audio signal transmission cable and a video signal transmission cable are respectively installed to transmit respective signals to each transmission cable.

However, in the case of transmitting audio and video signals with such a structure, two wirings should be installed when installing cables for signal transmission, which requires a lot of installation work, increases installation costs, and makes it difficult to maintain the installed system. There is a problem.

Therefore, in order to solve such a problem, a proposal for transmitting an audio signal together with a video signal transmission cable has been published in US Patent Application Publication 2004/0189869 (Apparatus and method for transmitting audio over a dedicate video line).

In the NTSC video output example, some video signal-free intervals (scan line regression intervals) are included in front of and behind a horizontal line of video output to the monitor. In addition, a little section is used immediately before or immediately after the effective video. Using this method, one or two audio signals obtained while one line of an image is scanned can be added to every image line signal. The appropriately sampled voice signal is output to the speaker via the decoder circuit of the receiver.

However, this method has a fixed frequency of 15 kHz due to the structure of each line of speech. For example, when the horizontal frequency is 15 kHz, the voice sampling is unconditionally fixed at 15 kHz. There is a problem that it is difficult to control the quality of the voice signal, and it is impossible to remove noise included in the analog signal due to the direct transmission according to the switching of the analog signal, and there is a problem such as signal attenuation.

Therefore, there is an urgent need to develop a signal transmission / reception method and apparatus capable of solving the above-described problems.

In order to solve the problems as described above, the present invention can deliver both video and audio signals using only one transmission and reception, it is possible to reduce the line installation cost, so that an effective system configuration is possible to reduce costs and easy installation cost management In particular, there is no frequency band limitation of a video signal, and an object of the present invention is to provide a method and apparatus for transmitting and receiving audio and video signals using a single transmission / reception cable that can perform the same while maintaining the signal quality of an existing video signal.

In order to achieve the above object, the present invention

In the method for transmitting and receiving analog audio and video signals,

Detecting a video scanning blank section from the video signal;

Sampling a voice signal from an input voice signal;

Compressing the sampled audio signal with respect to a time axis corresponding to the frequency of the video signal;

A fourth step of synthesizing the compressed audio signal into the detected image scanning blank section; And,

And a fifth step of transmitting the video signal synthesized with the audio signal through a single transmission / reception cable.

Also,

In the device for transmitting and receiving analog audio and video signals,

A blank section detection section for detecting a video scanning blank section from the video signal input from the video signal receiving section;

An audio signal compression unit for sampling the audio signal from the audio signal input from the audio signal receiver, and compressing the sampled audio signal with respect to the time axis corresponding to the frequency of the video signal;

An audio signal synthesizing unit for synthesizing the compressed audio signal into the detected image scanning blank section; And,

It provides an audio and video signal transmission and reception apparatus using a single transmission and reception cable, characterized in that it comprises a video audio transmission unit for transmitting the video signal synthesized with the audio signal in a single transmission and reception cable.

According to the method and apparatus for transmitting and receiving audio and video signals using a single transmission / reception cable of the present invention, it is possible to transmit both video and audio signals while using only one transmission / reception path, thereby reducing the line installation cost, thus enabling an effective system configuration to reduce costs. And there is an advantage that the installation ubiquitous management is easy, in particular, there is no frequency band limitation of the video signal, it is possible to obtain the effect of performing this while maintaining the signal quality of the existing video signal.

In addition, as a large number of voice signals can be transmitted and received, a plurality of voice signals for the same section can be retransmitted and used in average, thereby reducing noise and attenuation of signal intensity caused by transmission of analog signals. There is an effect that can improve the quality of the signal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a method for transmitting and receiving audio and video signals using a single transmission / reception cable, comprising: a first step of detecting an image scanning blank section from a video signal; Sampling a voice signal from an input voice signal; Compressing the sampled audio signal with respect to a time axis corresponding to the frequency of the video signal; A fourth step of synthesizing the compressed audio signal into the detected image scanning blank section; And a fifth step of transmitting the video signal synthesized with the audio signal through a single transmission / reception cable.

The present invention is a method of transmitting (transmitting and receiving) analog video and audio signals using a single transmission / reception cable. The present invention is applicable to a video signal composed of a combination of a valid video section and a non-effective video section in transmitting a video. Representative video signal standards of this type include NTSC (National Television System (s) Committee) or PAL ( Phase-Alternating Line). For ease of explanation, the following explanation uses NTSC standard signals.

In general, in the NTSC standard signal, a frame is an entire video signal constituting one screen, NTSC is composed of 29.97 interlaced scanned video frames per second, and a field is two pieces of video data constituting one frame in an interlace method. Eliminate flickering. Next, the horizontal blank section is the section excluding the effective video section in the horizontal direction of the image (sync, porch), the vertical blank section is the section excluding the effective horizontal line section in the vertical direction of the image, and the Serration section is the vertical direction of the image. Signal line regression interval.

In the interlaced 720 * 480 (horizontal and vertical) NTSC series, one frame consists of two field signals, and one line of the field signals has a total of 858 pixels. One line of 858 pixels has 138 horizontal blank sections and consists of 720 effective pixels. One frame consists of a total of 525 lines, and 45 lines of the 525 lines are vertical blank sections. The present invention transmits a voice signal using the remaining sections except the serration section among the 45 blank sections.

The present invention is a method for transmitting audio together by sharing a video signal line without using a separate signal line in analog video transmission. Conventional TV signal transmission method using coaxial cable also transmits both video and audio signals using a single signal line, but the video signal band is limited to secure audio data frequency range. In the present invention, the limitation of the bandwidth limitation of the video signal is overcome by the time domain compression and the method of adding the audio signal to the video signal rather than the frequency modulation method of the audio signal. In addition, the signal quality of the voice signal is improved by using the cumulative average method of the voice signal. That is, in the conventional audio image transmission method, since the audio signal is distributed in the 4.5MHz band, the luminance and the color region of the image cannot be invaded in the corresponding region and thus receive a band limitation.

The structure of the whole system proposed by the present invention is composed of an analog audio-video transmission method and apparatus and a reception method and apparatus for receiving such a signal. The analog audio-video transmission method and apparatus receives video and audio inputs respectively, compresses the audio signal on a time axis, and sends the audio signal in addition to the analog video signal. On the contrary, the analog audio-video receiving method and apparatus receives the audio-video signal from the compressed and transmitted signal as described above and outputs the compressed audio signal with respect to the time axis according to the voice frequency period.

This will be described in more detail together with the drawings as follows.

That is, in the method of transmitting and receiving analog audio and video signals, a first step of detecting a video scanning blank section excluding an effective video section containing actual video information from a video signal is performed, and is performed from an external or audio receiver such as a microphone. Performing the second step of sampling the audio signal from the input audio signal (at regular intervals) to obtain a sampled audio signal and to carry the sampled audio signal on the video signal for transmission. Performing a third step of compressing; synthesizing the compressed audio signal to the detected image scanning blank section; and subsequently transmitting a video signal synthesized with the audio signal through a single transmission / reception cable. The transmission is performed including the step 5, and the signal received from the transmission signal is a voice signal and zero Separating the signal and performs a reception process, such as to restore the separated audio signal, there is shown an example of a transmission portion 1 has a specific example block diagram of the device applied thereto.

That is, the present invention provides a transmitting and receiving device capable of performing the above method, which is an apparatus for transmitting and receiving analog audio and video signals, the blank for detecting an image scanning blank section from an image signal input from an image signal receiver. An interval detection unit; An audio signal compression unit for sampling the audio signal (at a predetermined period) from the audio signal input from the audio signal receiving unit and compressing the sampled audio signal with respect to the time axis corresponding to the frequency of the video signal; An audio signal synthesizing unit for synthesizing the compressed audio signal into the detected image scanning blank section; And a video audio transmitter for transmitting the video signal synthesized with the audio signal through a single transmission / reception cable. Of course, additional modules are also shown in FIG. 1, but the basic components are as described above.

In more detail, the image receiving unit of the analog audio image transmitting apparatus is an apparatus that receives an analog image signal. Receives analog video signal from camera input or external source. The analog video signal inputted through the video receiver comprises a section having valid video information and a video blank section having no such information. The video signal enters the video blank section detection unit. As illustrated in FIG. 7, the video blank section detector detects vertical and horizontal blank sections of the analog video signal and transmits a blank signal to the audio signal synthesizer. As a specific example of this, the voice signal obtained in a frame or field unit can be loaded as data on several horizontal blank lines of a vertical blank area of one frame.

The voice receiver is a device that receives a voice signal input through a microphone or the like and a voice signal input from the outside. The received voice signal is quantized by a suitable interval of periods. In general, voice signals are quantized by various sampling periods (reference clocks) such as 24 kHz, 48 kHz, and 96 kHz. In contrast, an image signal has a sample period of several tens of MHz such as 13.5 MHz, 27 MHz, and 28.63 MHz.

Therefore, if a voice signal is sampled from the voice signal input from an external or voice receiver such as a microphone and compressed on the time axis, more voice signals can be obtained and transmitted to the video signal, which will be described later. It is possible to perform multiple transmissions for the same voice signal.

The audio signal compression unit compresses and reorders the audio signal sampled in this manner according to the frequency, which is the sample period of the video signal, and rearranges the audio signal. A specific example thereof is as shown in FIG. 3. Here, the sampled audio signal samples the audio signal at a constant sampling period. For example, sampling the audio signal at a frequency of 1 / k times the frequency of the video signal, and simply compressing it to be the video signal frequency, results in k-times compression. In addition, a PLL or the like may be used to compress the video signal frequency to be j times (j is an integer greater than 1) or 1 / j times the frequency. Therefore, the compression corresponding to the frequency of the video signal means that the audio signal sampled at an arbitrary sampling period is compressed to a video signal frequency or a frequency corresponding to j times or 1 / j times thereof.

Through this, the audio signal quantized in units of several KHz is rearranged in the video sample cycle of several MHz. Through such a process, the amount of voice signal information that can be transmitted at the same time can be transmitted from several hundred times to thousands of times.

In this way, the compressed audio signal in the time domain is directly transmitted to the audio signal synthesizing unit, and the compressed audio signal is synthesized by adding or replacing (substituting) the blank section of the video signal to a video and a single line. It can carry a voice signal.

Preferably, the method may further include the step of adding a voltage value having a luminance value of 0 to at least an analog video signal to the audio signal. The apparatus may further include an offset adder configured to add a voltage value having the luminance value 0. The adding may be performed at any stage between sampling after the speech signal and before synthesizing the speech signal, and the adding may be arranged at any interval between the second and fourth stages. Accordingly, in the apparatus, the offset adder may be located in a section from the voice signal receiver to the voice signal synthesizer, that is, anywhere therebetween. In the case of FIG. 1, the offset adder is disposed between the compressor and the combiner. It is shown.

In this case, the compressed voice signal enters the offset adder. The offset adder adds an offset DC value to the existing audio signal by a pedestal level (a voltage value having a luminance value of 0 in the analog video signal) to add the audio signal to the analog video signal. Detailed description will be described with reference to FIG. 5. That is, as shown in the figure, the compressed voice signal moves based on 0V offset. In order to transmit audio signal together with analog video signal, it is necessary to apply DC offset as much as pedestal level. If the audio signal that is not applied to the pedestal level is directly transmitted along with the analog video signal, the receiving device misjudges the audio signal falling below the pedestal level as the sync interval of the video. There is concern. Therefore, in order to remedy this concern, an offset value may be added, which may be added only by a value corresponding to the pedestal level as described above, and when a larger value is added, the above concern may be solved, thus adding a larger value. You may.

Next, the vertical and horizontal sync input through the analog video blank section detector are transmitted to the voice signal synthesizer. The voice signal synthesis unit selects a blank section to carry the voice based on the detected sync. And the compressed cumulative speech signal with pedestal offset applied to the selected horizontal blank section is sent along with the image. A detailed description thereof is as shown in FIG. 6. That is, based on the horizontal sync signal detected by the image blank section detector, the voice signal synthesis unit increases the internal counter to find a horizontal line in the vertical blank section. For example, if a frame consists of 525 lines, the image blank section detector generates 525 horizontal sync signals. The audio signal synthesizing unit finds a horizontal line of a vertical blank section in which the audio signal is to be loaded during the video line section of 525 lines. The horizontal line sending the voice specifies a predetermined position so that the receiver can know. As shown in FIG. 6, the voice signal synthesizing unit appropriately loads a voice signal in a horizontal line sync section of a vertical blank section. A specific example of a signal that is synthesized and transmitted is as shown in FIG. 7.

Also preferably between the second step and the fourth step, together with the sampled voice signal of the current step, from the previous to the mth previous (m is an integer greater than 1) with the sampled voice signal of the current step. And storing the voice signals of the previous step, wherein after the storing step, the stored voice signals are processed together, and the synthesis of the fourth step includes the stored m previous step compressed voice signals and the current step. It is possible to synthesize the compressed voice signal of.

In addition, in order to perform such a method, the transmission and reception apparatus includes at least one m-th previous (m is greater than 1) at least in one of the sections from the voice signal receiving unit to the voice signal synthesizing unit. A memory for storing the voice signals of the previous step up to an integer); Storing the voice signal of the current step together with the voice signals of the previous step from immediately before the voice signal of the current step obtained from the memory to the mth previous (m is an integer greater than 1). It may be configured to further include a cumulative storage unit for synthesizing the voice signal of the previous step and the voice signal of the current step and delivering it to the voice signal synthesizing unit.

That is, as described above, since a large amount of voice signals can be transmitted through voice compression on the time axis, the above process is performed to use the same for restoring noise and signal attenuation generated from analog signals. . This cumulative storage step can be placed anywhere between the second and fourth steps to perform the cumulative process, after which a plurality of voice data blocks are handled together through the same process as described above. In addition, the additional component may be disposed in any one of the sections from the voice signal receiving unit to the voice signal synthesizing unit to enable the process to be performed.

As a specific example of this, in the case of having the arrangement as shown in FIG. 1 (more preferably, it is stored in a compressed form at the time of storage), the compressed voice signal is transmitted to the cumulative storage unit. A detailed example of this is illustrated in FIG. 4. Referring to this description, the cumulative storage unit accumulates and stores, in units of frames, an audio signal re-arranged (compressed with respect to a time axis) in a video signal quantization period. The visible image is composed of tens of frames per second. The audio signal obtained during one frame has hundreds or thousands of data depending on the sampling period. In the present invention, the voice signals obtained in one frame are not transmitted only to the corresponding frame, but N, N-1, N-2,... In this case, all voice signals of N-m frame are sent. Using such a method, the audio image transmitting and receiving apparatus may have an effect of receiving the same signal as many times m as for the audio signal obtained in one frame. The voice signal transmitted several times in the same frame compensates for the attenuation and disturbance generated during the analog transmission process. That is, the voice signal transmitted in the N (current) frame can be transmitted up to the voice data before the m frame according to the m coefficient. The voice signal accumulating storage unit stores the voice data for the previous frame by m number by using the voice data storage memory. The coefficient m is not infinite and has a finite value according to the voice sample period and the number of image blank intervals. In the present invention, the reason for accumulating the voice signal corresponding to several frames is to accurately restore the signal against attenuation and external noise generated on the cable by receiving and averaging the same voice data on the receiving side several times. . In the present invention, since the voice signal is transmitted in an analog form instead of digitally, the voice signal is accumulated and transmitted in consideration of external disturbance and signal cable attenuation. The accumulated voice signal uses a method such as a frame tag signal or a predetermined interval to distinguish between frames.

As described above, the voice signal including the multi-level voice signal (voice signal corresponding to a plurality of frames) is subjected to signal processing through the processes of FIGS. 5 to 6, and specific examples of the signals thus formed are shown in FIG. 7. .

Next, the signal transmitted as described above is received by the receiver to separate the audio signal therefrom and transmit the audio and video signals. A specific example of the device configuration of the receiver side is as shown in FIG.

That is, the receiving method includes a sixth step of detecting an image scanning blank section from the video signal synthesized with the audio signal transmitted in the fifth step; A seventh step of separating the compressed audio signal from the image scanning blank section; An eighth step of expanding the separated voice signal into an original voice signal; And a ninth step of transmitting the processed video and audio signals, respectively.

In addition, the apparatus for performing such a receiving method includes a receiver blank section detection section for detecting a video scanning blank section from the video signal synthesized with the audio signal transmitted from the video audio transmitter; An audio image separating unit for separating the compressed audio signal from the image scanning blank section; A voice signal extension unit for extending the separated voice signal into an original voice signal; And a video signal transmitter and an audio signal transmitter for transmitting the processed video and audio signals, respectively.

That is, the video scanning blank section is detected from the signal transmitted from the video audio transmitter for transmitting the synthesized signal as shown in FIG. 7, and thus the audio signal is separated from the detected blank section. As described above, the audio signal is restored to the originally received audio signal through the reverse process based on the information of the original compression process, so that the normal video signal from which the audio signal is separated and the audio signal restored to the original frequency are respectively transmitted. . In this case, the audio signal and the video signal may be transferred to the next step immediately after the signal processing process, and if a time delay occurs between the two signals in the signal processing process, the two signals matched with each other may be corrected through a synchronization process. Can be sent.

Referring to FIG. 2, a detailed example of the audio image receiving apparatus proposed by the present invention is as follows. The analog video-audio signal is input to the video-audio receiver. The received signal is attenuated according to the cable length. In the present invention, an analog amplifier can be used to compensate for this attenuation. The signal past the analog amplifier goes through the reverse process of the transmission. The audio image signal transmitted to the image blank section detection unit detects horizontal and vertical sync. The audio image separating unit separates the audio signal and the video signal based on the detected sync signal.

That is, the image blank detector detects the horizontal sync and vertical sync sections and passes the signal to the audio image separator. The voice image separator recognizes the voice signal transmitted to the promised position based on the detected sync signal. The audio image separator proceeds to the next process of determining the separated audio image signals. In the case of the video signal, the detected audio signal is removed and output to the outside through the video output terminal and the transmitter. In parallel with this, the voice signal proceeds in a reverse process to that of the voice transmission. In this case, the process of decompressing the voice signal performs the process opposite to the process of compressing the voice signal. A series of processes of the receiving apparatus performed so far have been performed in the image signal domain (MHz). The reason why the audio signal is processed in the video signal domain is that the quantized signal with a high period can process more data as in the transmission process. The receiving board needs to switch to the original voice sampling period domain to output the final voice data. The device which plays such a role is a voice signal extension unit.

Preferably, when the offset addition is performed in the transmission process, the offset addition must be removed in the reception and restoration to the original audio signal. Therefore, between the seventh and ninth steps, And subtracting the voltage value from the extracted voice signal, and in terms of the device, the voice signal extracted from the blank period in one of the sections from the voice signal separator to the voice signal transmitter. It may be configured to further include an offset subtractor for subtracting the voltage value. That is, the offset subtractor performs a process of subtracting the DC level raised by the pedestal level as opposed to the audio image data transmission process. As illustrated in FIG. 8, the audio signal having the pedestal level subtracted maintains a signal level of 0V. In the case of illustration, the pedestal level is subtracted, but if the addition value is different, the value corresponding to the addition value is subtracted.

In addition, when the multi-stage voice signal is stored (cumulatively) in the transmission process, the cumulative signal may be averaged to compensate for noise and attenuation of the analog signal. That is, when the cumulative storage is performed, the eighth step may store m + 1 voice signals separated from the stored m previous step compressed voice signals and the current step compressed voice signals, and store the previously stored voice. From the signals, the average speech signal is generated by averaging the speech signals stored in m previous stages corresponding to the first speech signal among the separated speech signals in the present stage and the first speech signal separated in the present stage, The process may be further performed to extend the average audio signal corresponding to the frequency of the video signal. In terms of apparatus, as shown in FIG. 2 to perform the above process, in any one of the sections from the voice signal separating unit to the voice signal transmitting unit, A receiver memory for storing the separated voice signals of the previous step from immediately before to the mth previous (m is an integer greater than 1); And an average sound by averaging the voice signals stored in m previous stages corresponding to the first voice signals among the separated voice signals in the current stage and the first voice signals separated in the current stage from the pre-stored voice signals. It may be configured to further include a cumulative speech signal averaging unit for generating a sex signal.

2 illustrates a case where the additional configuration is disposed between the subtraction unit and the extension unit, and may be added to any one of the sections from the voice signal separation unit to the voice signal transmission unit.

As a specific example of this, referring to FIG. 9, FIG. 9 is an example of transmitting four voice signals at a time to transmit voice data of one frame at a time. In this case, the audio data corresponding to the frame m = 3) is always stored. Using this method has the advantage of receiving the same voice data obtained four times at a time. In the present invention, the voice signal transmitted in analog form is used to recover the original signal close to the original signal using the same voice data obtained four times. The video signal as well as the audio signal are transmitted through the transmission line in analog form, and thus have weak characteristics against attenuation and external noise depending on distance. In the present invention, the same data is retransmitted and collected and averaged several times in order to recover the attenuated and distorted original signal. (Averaging can be applied to various averaging methods.) As it is repeated, the audio signal can recover a signal close to the original signal, and thus may increase according to the required quality level.

The case where transmission data and received data are shown is shown in FIG. In this case, as shown in FIG. 9, the same data is transmitted and received four times, but the number and duration of the transmitted voice data can be changed at any time according to a user and an implementer. FIG. 11 illustrates a measurement process of a process in which an input voice signal is added to a vertical blank section of an image and transmitted and a process in which voice data obtained from a receiving device is output. The input to output signal recovery ratio shown in the embodiment may be increased as the number of overlapping of the transmitted audio signal increases.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various modifications and changes made by those skilled in the art without departing from the spirit and scope of the present invention described in the claims below. Changes are also included within the scope of the invention.

1 is a block diagram illustrating an embodiment of a transmitter of an audio and video signal transmitting and receiving apparatus according to the present invention.

2 is a block diagram illustrating an embodiment of a receiver of an audio and video signal transmitting and receiving apparatus according to the present invention.

3 is a view schematically showing the operation of the audio signal compression unit in the transmitter of the audio and video signal transmission and reception apparatus of the present invention.

4 is a view schematically showing the operation of the cumulative storage unit in the transmitter of the audio and video signal transmission and reception apparatus of the present invention.

5 is a view schematically showing the operation of the offset adder in the transmitter of the audio and video signal transmission and reception apparatus of the present invention.

6 is a view schematically showing the operation of the audio signal synthesizing unit in the transmitting unit of the audio and video signal transmitting and receiving apparatus of the present invention.

7 is a diagram schematically showing an embodiment of a signal transmitted from a transmitter of an audio and video signal transmitting and receiving device of the present invention.

8 is a view schematically showing the operation of the offset subtractor in the receiver of the audio and video signal transmitting and receiving apparatus of the present invention.

9 is a view schematically showing the operation of the cumulative audio signal averaging unit in the receiving unit of the audio and video signal transmitting and receiving device of the present invention.

10 is a view schematically showing the operation of the audio signal extension unit in the receiver of the audio and video signal transmitting and receiving device of the present invention.

FIG. 11 is a diagram illustrating comparison and comparison of audio signal input signals and output signals through audio and video signal transceivers of the present invention.

Claims (12)

In the method for transmitting and receiving analog audio and video signals, Detecting a video scanning blank section from the video signal; Sampling a voice signal from an input voice signal; Compressing the sampled audio signal with respect to a time axis corresponding to the frequency of the video signal; A fourth step of synthesizing the compressed audio signal into the detected image scanning blank section; And, And a fifth step of transmitting the video signal synthesized with the audio signal through a single transmission / reception cable. The method of claim 1, Between the second step and the fourth step, And adding a voltage value having a luminance value of 0 to at least an analog video signal to the audio signal. The method according to claim 1 or 2, Between the second step and the fourth step, Storing, together with the sampled speech signal of the current stage, the speech signals of the previous stage from immediately preceding the compressed speech signal of the current stage to the mth previous (m is an integer greater than one). After the storing step, the voice signals stored together are processed together, The synthesizing of the fourth step comprises: synthesizing the stored m previous compressed audio signals and the compressed audio signal of the current step. The method of claim 1, A sixth step of detecting an image scanning blank section from the video signal synthesized with the audio signal transmitted in the fifth step; A seventh step of separating the compressed audio signal from the image scanning blank section; An eighth step of expanding the separated voice signal into an original voice signal; And, And a ninth step of transmitting the processed video signal and the audio signal, respectively. The method of claim 4, wherein Between the second step and the fourth step, Adding a voltage value having a luminance value of 0 to at least an analog video signal to the audio signal; Between the seventh and ninth steps, And subtracting the voltage value from the audio signal extracted from the blank section. The method according to claim 4 or 5, Between the second step and the fourth step, Storing, together with the sampled speech signal of the current stage, the speech signals of the previous stage from immediately preceding the compressed speech signal of the current stage to the mth previous (m is an integer greater than one). After the storing step, the voice signals stored together are processed together, The combining of the fourth step comprises combining the stored m previous compressed speech signals and the compressed speech signal of the current stage, The eighth step, Storing the separated m + 1 voice signals comprising the stored m previous compressed voice signals and the current compressed voice signal, From the previously stored voice signals, the average voice signal is averaged by averaging the voice signals stored in the m previous stages corresponding to the first voice signal among the separated voice signals in the present stage and the first voice signal separated in the current stage. Create, The method of transmitting and receiving audio and video signals using a single transmitting and receiving cable, characterized in that for extending the average audio signal corresponding to the frequency of the video signal. In the device for transmitting and receiving analog audio and video signals, A blank section detection section for detecting a video scanning blank section from the video signal input from the video signal receiving section; An audio signal compression unit for sampling the audio signal from the audio signal input from the audio signal receiving unit and compressing the sampled audio signal with respect to a time axis corresponding to the frequency of the video signal; An audio signal synthesizing unit for synthesizing the compressed audio signal into the detected image scanning blank section; And, And a video audio transmitter for transmitting the video signal synthesized with the audio signal through a single transmission / reception cable. The method of claim 7, wherein In any one of the sections from the voice signal receiver to the voice signal synthesizer, And an offset adder configured to add a voltage value having a luminance value of 0 to at least an analog video signal to the audio signal. 9. The method according to claim 7 or 8, In any one of the sections from the voice signal receiver to the voice signal synthesizer, A memory for storing audio signals of the previous stage from at least before the current speech signal to the mth previous (m is an integer greater than 1); And, Storing the voice signal of the current step together with the voice signals of the previous step from immediately before the current signal obtained from the memory to the mth previous (m is an integer greater than 1), and storing the stored m previous steps And a cumulative storage unit for synthesizing the voice signal and the voice signal of the current stage and transferring the synthesized voice signal to the voice signal synthesizing unit. The method of claim 7, wherein A receiver blank section detector for detecting a video scan blank section from the video signal synthesized with the audio signal transmitted from the video audio transmitter; An audio image separating unit for separating the compressed audio signal from the image scanning blank section; A voice signal extension unit for extending the separated voice signal into an original voice signal; And, An apparatus for transmitting and receiving audio and video signals using a single transmission / reception cable, comprising a video signal transmitter and an audio signal transmitter for transmitting the processed video and audio signals, respectively. The method of claim 10, In any one of the sections from the voice signal receiver to the voice signal synthesizer, An offset adder for adding a voltage value having a luminance value of 0 to at least an analog video signal to the audio signal; In any one of the sections from the voice signal separator to the voice signal transmitter, And an offset subtractor configured to subtract the voltage value from the audio signal extracted from the blank section. The method according to claim 10 or 11, wherein In any one of the sections from the voice signal receiver to the voice signal synthesizer, A memory for storing audio signals of the previous stage from at least before the current speech signal to the mth previous (m is an integer greater than 1); And, Storing the speech signal of the current stage together with the speech signals of the previous stage from immediately before the speech signal of the current stage obtained from the memory (m is an integer greater than 1), and storing the stored m previous stages. And a cumulative storage unit for synthesizing the voice signal and the voice signal of the present stage and transferring the synthesized voice signal to the voice signal synthesis unit. In any one of the sections from the voice signal separator to the voice signal transmitter, A receiving unit memory for storing the separated speech signals of the previous stage from at least before the current compressed speech signal to the mth previous (m is an integer greater than 1); And, From the pre-stored voice signals, the average voice signal is obtained by averaging the voice signals stored in the m previous stages corresponding to the first voice signals of the separated voice signals in the current stage and the first voice signals separated in the current stage. Audio and video signal transmission and reception apparatus using a single transmission and reception cable, characterized in that it further comprises an average cumulative voice signal generating.

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